Loom dobby



1927' J. F. BLACKMON v LOOM DOBBY 2 Sheets-Shut 2 Filed Dec. 6, 1926 Patented Aug. 30, 1 927.

, UNITED. STATES PATENT, OFFICE.

JOHN FREDERICK BLACKMON, OF LAURENS, SOUTH CAROLINA.

100M BOBBY.

I Application filed December 6, 1926. Serial No. 152,863.

My invention relates to loom dobby constructions, more particularly to the pattern determined intervals. The side edge borders ativelylengthy upper pattern chain.

are formed through the medium of the main, or lower pattern cylinder mechanism, and suitable means on the loom holds the lower pattern cylinder inoperative while the upper or auxiliary cylinder is in operation. Operating connection is maintained between the upper and lower dobby fingers by means of links connected between-the front ends of the fingers, and the pattern chain of the upper pattern cylinder is confined within the dobby head'behind the wall of connecting links. Due to the necessarily limited space, the upper pattern chain must be short, and as a consequence only a limited design can be utilized for end borders.

It is an'object of my invention to provide a structural arrangement of dobby head mechanism constituting a means whereby an upper pattern chain may be employed, the lengthof which is only determined by the power of the loom to pull it. therebypermitting the utilization of a practical y. un-

limited. fieldof more complicated end border design weaving than is now possible.

Another ob'ect is the provision in a dobby head mechanism of this general type, of means operatively connecting theupper and lower dobby fingers in such manner as to leave the front of the dobby frame open to accommodate passage therethrough of a rel- A further object is the provision of a'novel operating connection means between sets of upper and lower dobby fingers.

f With these and such other objects in view as will be apparent. from the description, the invention resides inthe novel construction, combination andarrange'ment of parts hereinafter described and'claimed, and illustrated in the accompanying drawings,"

wherein is shown one practical embodiment of the principles of the invention.

Figure 1 is substantially aside elevation of a dobby frame illustrating the connection between upper and lower sets of the dobby fingers.

Figure 2 is an end elevation of the dobby fingers and their connecting elements.

Figure 3 is a perspective view of an applied connector, between a pair of vertically aligned dobby fingers.

Figure 4: is a perspective of the connector element shownin Figure 3.

7 Figure 5 is a perspective of another, of the connector elements employed.

As shown in Figure 1, the reference character 10 indicates generally the frame of a dobby head of the type shown in the above referred to Hattoy patent. The frame carries a main lower pattern drum or cylinder 11 provided with the conventional pattern chain 12 in the usual manner. A shaft 13 disposed. transversely across the dobby head forms the pivot for the lower dobby fingers. These fingers are arranged in sets of pairs, side by side across the'head, but for convenience of'illustration only thecomponent members of one pair are illustrated. One finger 14 is substantially of the conventional lower dobby finger configuration. ex-

cept that its upturned rear end. upon which rests a jack hook 15 is formed with a subchain. 20 differs from the lower pattern chain in that it is passed through the open front of the. dobby head and is of considerable length, being supported by means (not 1 shown) externally of the dobby head.

. The upper sets of dobby fingers are pivoted'on a shaft 21 arranged above the shaft 13, and the sets of these upper fingers are arranged in pairs similar to and'vertically aligned above the. sets of lower fingers. Each of the upper dobby fingers, one of whichis shown a's22, and the other as 23, are provided with rear end extensions- The finger 22' is arranged in vertical alignment over the lower finger '14. and has its rea estensien a4. turned dewa aaraiy and perforated :tor a purpose to be described. The finge 23 arranged over the lower linger 17, has i rear end extrusion in the form of :1 lug identical with the lug l8 oi the lower linger over which it is. arranged.

its best shown in Figures 3 and 4 the element operatively connecting the rear ends oi the uppeand lower lingers 22 and 14:; comprises a rod 526 having a straight shank and being bent at a right angle at each end to form securing pins 27 and 28, the upper of which, 27, is adapted for engagement in the perforation of the rear end extension 24 of the upper finger and the lower of which, 28. is adapted to be received in the slot 16 with which the rear extension of the lower (lobby linger 14- is provided. Interincdiate its ends the rod 26 has rigidly secured thereto, by welding or othersuitable means. a wire 29 paralleling the rod 26 through the major portion of its length. The lower end of the wire 29 is bent outwardly and down to form a guard finger 30 adapted to engage over the side of the rear extension of the lower linger 14: opposite to the side from which the pin 28 is inserted in the slot 16. At its upper end the wire 29 is bent upon itself to form a guard 31 adapted for engagement over the side of the upper linger extension .Zl opposite to that "from which the pin 52? is inserted in the perforation with which the extension is provided. By the provision of the guards 30 and 31, the connecting rod :26 is securely retained in position when applied, and as the wire 29 is connected to the rod at an intermediate point, the ends (it the wire have sullicient flexibility to be separated from the ends of the rod, permitting application thereof in service position. The inherent tension of the wire 29 will restore the guards to normal position.

The upper and lower (lobby fingers 23 and 17 respectively, are connected by a push rod 32 having a straight shank. the lower end of which seated on the flat top edge of the lower (lobby finger lug 18. At its upper end the rod 3 is formed in an elongated loop 83 passed over the rear lug Q of the upper dohby finger 28. The loop 1 is extended upwardly suiliciently so that its top terms a seat for an upper jack hook of the loom. In the operation oi the 100m while the design is w wed in the main body portion of the work. the loom mechanism holds the. upper pattern cylinder inoperative while the lower pattern cylinder is operated to move its pattern cha n '12 beneath the sets of the lower fingers 14: and 17. When a finger 14 is rocked on its pivot the rear end supporting a jack hook is depressed, permitting the ack hook to engage the usual knife (not shown). The length of the connecting rod 26 is such that normally the pin 28 rests on the bottom of the slot 16, and consequently on depression of the rear end of the finger let, the pin 28 rides free in the slot and there is no actuation of the corresponding upper dobby finger Likewise, movement oi the lower dobby finger l7 depresses the lug l8, and by virtue of the elongated loop 33 at the upper end of the rod 32, no corresponding actuation of the upper dobby linger 23 is brought about.

However in the design weaving for the end borders it is necessary that the corresponding sets of upper and lower dobby fingers move in unison. \Vhen the border point is reached. the looni mechanism renders the lower cylinder 11 inoperative and throws the upper cylinder 19 into operation. As under the action of the pattern chain 20 the upper (lobby linger 22 is rocked on its pivot, the rear extension 24 will be depressed and by virtue of the fact that the pin 28 of the connecting rod 26 rests on the bottom of slot 16, the corresponding lower dobby finger 14 will also be rocked on its pivot. Likewise, as in normal inoperative position, the rear lug E251 oi the upper dobby linger 23 rests on the bottom of the loop 83, when the lug is depressed through rocking of the finger, the lower end of the push rod 32 will cause a corresponding rocking of the lower dobby linger 17 on its pivot, and the jack hook 34 will be lowered for engagement with the knife (not shown).

I clain1:-

1. In a loom dobby having a main pattern cylinder and an auxiliary pattern cylinder with dobby fingers associated with each, members operatively connecting said dobby tii'igers at points between said cylinders and the (lobby iraine adjacent the shedding levers of the 10011].

2. In a lOOlH dobby having upper and lower pattern cylinders and sets oi? (lobby lingers cooperating with the respective cylinders, rods connecting the inner ends of vertically aligned pairs of said (lobby lingers.

In a 100m dobby having upper and lower pattern cylinders and sets of dobby fingers cooperating with the respective cylinders, extensions formed on the inner ends of said fingers. and rods o ieratively connecting vertically aligned pairs of said cxtensions.

at. In a looni dobby having upper and lower pattern cylinders, a set of dobhy fingel-s disposed for cooperation with each ol said cylinders, means pivotally mounting said fingers at a point in rear of said cylinders and intermediate the ends of the tingers, and rods operatively connecting the ends of said fingers in vertically aligned pairs. said rods being disposed in rear ot the pivotal point of the fingers.

In a loom (lobby, a lower pattern cylinder, an upper pattern cylinder, lower dobby fingers and upper dobby fingers cooperating with said cylinders respectively, and means disposed internally of the dobby behind said cylinders for actuating said lower fingers from corresponding upper fingers.

6. In a loo1n-dobby, a pattern cylinder, and a pattern chain on said cylinder supported for passage through the frontof the dobby. v

7. In a 100m dobby, an upper pattern 10' cylinder, a lower pattern cylinder, dobby fingers associated with said upper cylinder,

dobby fingers associated with said lower cylinder, rear end extensions formedon said dobby fingers, and operating rods connecting Vertically aligned pairs of said extensions, said rods being arranged for depressing the extensions of said lower fingers upon depression of the extensions of said upper fingers.

In testimony whereof I affix my signature. 20

JOHN FREDERICK BLACKMON. 

